Piston vise



June 15 1926.

D. A. ANDERSON ET AL PISTON VISE Filed Jan. 29, 1925 Gee/ye ill Patented June 15 1926 UNITED STATES Phr'llihl'l OFFHCE.

"DAVID A. ANDERSON AND GEORGE L. ANDERSON, OF FARIBAULT, MINNESOTA.

PISTON VISE.

Application filed January 29, 1925.

eon'ibnstionengine and to this end, generally stated, the invention consists of the novel dev' es and combinations of devices hereinafter described and defined in the claim.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several Views.

Referring to the drawings:

Fig. 1 is a view partly in side elevation and partly in central section showing the piston vise held in a horizontal position by the jaws of a bench vise and said piston vise holding a piston assembly by its piston. pin;

Fig. 2 is a view partly in side elevation and partly in sectionshowing the piston vise mounted in an upright posi ion on a bench and holding a piston assembly by clamping the piston on, the face plate of the vise, said piston assembly being diagrammatically illustrated;

Fig. 3 is a front elevation of the parts shown in Fig. 2;

4.. is a fragmentary view showing the face plate in plan; and

Fig. 5 is a perspective view of the clamping member for holding a magneto on the face plate.

This piston vise comprises flat base 6 I having at one end a round face plate 7, at

the axis of which is a bore-like seat 8. Intcgrally formed with the base 6 rearward of tie face plate 7 is frame 9, the enter end portion of which extends laterally over the face plate 7 and has hub 10. A hand screw 11 has a screw-threaded engagement: with the bearing leg 1.0 for endwise adjustment toward and tr =11 the face plate 'I' and i.- ncd with the seat 8. (lo-operating axially aligned stationary and movable conical bearing points 12 and 18 are meanted. the former on the face plate 7 and the con the inner end of the hand screws The stationary bearing poi at 12 has a tom 1% which extends into the 8 and rw'novably holdssaid point on the face plate 7, and the bearing point 13 has a bore-like recess 15 into which extends a short stem 16 on the inner end of the hand screw 11. A friction ball 17, carried by the stem 16, reinovably holds the bearing point 13 on said stein.

Integrally formed with the under side of Serial No. 5,546.

the base 6 is an anchoring lug 18 tapped to receive a washer-equipped clamping screw 19. In Fig. 1, the anchoring log 18, as shown held by the ewe 20 of a bench vise, supports the piston vise in a horizontal posi' tion. In Figs. 2 and 8, the piston vise is supported in an upright position with its base 6 resting on a bench 21 having a seat 22 in which the anchoring log 18 extends. and is secured by the clamping screw 12, the washer of which engages the under side of said bench surrounding the seat 22.

In 1, the piston vise is shown holding a piston assembly by its piston pin 23. It will be noted that the conical bearing points 12 and 13 extend into the open ends of the piston pin 23, and under the clamping action of the piston vise, hold said pin from turning. 3y this method of holding a pi. 7 ton assembly, the piston 24: and the connecting rod 25 are free to swing on the piston pin 23 in a vertical plane when the piston vise is held shown in Fig. 1. With the piston assembly thus held, a mechanic may swing the piston 2e and the connecting rod 25 into a convenient position when operating the set screw 26 which clamps said connecting rod onto the piston pin 23, or when operating the set screw in the type of piston assembly in which the piston pin 23 is secured to the piston and the connecting rod is free to move on the piston pin. its is well known, it is very difticnlt to line up holes in one of the bearing sleeves of a piston and its piston pin so as to receive a fastening device for securing the piston pin to the piston, but when a piston assembly held as shown in Fig. l, the piston may be easily turned on its piston pin to bri aid as holes into alignment. By holding the piston assembly by its piston pin, as shown in Fig. 1. the same is not only securely held. but all danger of inarring, disturbing, or otherwise damaging the piston is eliminated.

To rigidly secure the piston as shown in Figs. 2 and 3 and in which it is clamped into the face plate 7, we provide clanipii'lsij head 27 in the form of a disc havin a raised conical seat 28 in which the bearing point 13 is seated and permits a wa-bble movement of said clamping head. The under side of this clamping head 27 is recessed to leave an annular depending bearing flange 29. it will be noted that the open end of the pi ton 22 rests on the face plate 7 and that the vlainping head 27 rests on the top of said piston. It is important to note that the diameter ot the clamping head 27 is such that its flange 29 rests on the head of thepiston 22 directly over the side walls thereof and inward at its rim grooves.

It may be here stated that the clamping head 27 will be furnished in different diameters for pistons of difi erent diameters, The recessed under side of the clamping head 27 aiiords clearance for a piston having a dome head. When the piston 22 is thus held, there is no danger of damaging the same as all of the clamping force is appliet directly over the walls thereof, and when thus held itis an extremely easy matter to place piston rings in their grooves or remove the same therefrom, ream the sides for the piston pin, or do other work thereon. In case the walls of the piston 22 are longer at one side so that the piston tips slightly on the face plate 7, the clamping head 27 will adjust itselhdue to its wabble connection with the bearing point 13 so that its bearing flange 29 rests on the head of the piston 22 throughout its entire circumference and with equal pressure. The notch 30 is formed in the face plate 7, extends radially toward the seat 8, and is provided to receive the connecting rod 25, as shown in Fig. 2.

Fig. 5 shows a clamping head 31 adapted to be substituted for the clamping head 2'? and used for clamping a magneto on the faceplate 7.

It is, of course, understood that for such WOli the bearing point 12 must be removed from the face plate.

The above described piston vise has in actual usage proven highly efiicient for the purpose had in view.

What we claim is:

A vise of the kind described comprising a base having a frame, a hand scr ,w mounted in the frame perpendicular to the base, a pair of axially aligned conical points the one on the base, the other onthe hand screw, and a clamping head having a work-engaging surtaceapplicable to the outer edge portion of the head of a piston on the base and having an open seat arranged to loosely receive the conical point on the hand screw by a movement of said screw toward the base, said base having a notch extended radially from its conical point and adapted to receive the connecting rod of the piston.-

tures.

DAVID A. ANDERSON. GEORGE L. ANDERSON.

In testimony whereof weatfix our signa- 

